#region License and Terms
// MoreLINQ - Extensions to LINQ to Objects
// Copyright (c) 2010 Leopold Bushkin. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion

namespace MoreLinq.Test
{
    static class Combinatorics
    {
        public static double Factorial(int n)
        {
            var fac = 1.0d;
            while (n > 0)
                fac *= n--;
            return fac;
        }

        public static double Binomial(int n, int k) =>
            Factorial(n) / (Factorial(n - k) * Factorial(k));
    }
}
